- Remove extraneous '-' in sudo note.
- Correct space formatting (minor).
- Simplify instructions for install EPEL and install with yum directly.
- Add `nodejs` to yum install list explicitly to match the comments -- more transparent for new users who might not be clear `npm` package also installs `nodejs`.
- Remove '--noprealloc` from MongoDB example as the option has been depcated since Mongo 2.6 and is now the default behaviour. See: http://docs.mongodb.org/manual/reference/program/mongod/
Signed-off-by: Charles Chan <charleswhchan@users.noreply.github.com>